The team yesterday added Tim Byrdak to the 40-man roster, officially ending the lefty specialist competition. Michael O’Connor, the other remaining candidate, was optioned to the minor leagues. It could leave manager Terry Collins and general manager Sandy Alderson with three names — Isringhausen, Blaine Boyer and Pedro Beato — for two relief jobs.

Isringhausen participated in a minor league scrimmage yesterday, his first action since incurring swelling in his right elbow last weekend. The 38-year-old righty allowed four hits and four unearned runs over two innings.

“I’ve got to get him back in major league games,” Collins said after the Mets’ 6-5 loss to the Marlins in an exhibition game.

Beato’s status as a Rule 5 draft pick could give him an edge in making the team, as the Mets would have to send the righty back to the Orioles if he isn’t placed on the 25-man roster. The Mets are also impressed with Boyer’s work this spring. The righty has a 1.00 ERA in eight appearances.

Isringhausen has said he won’t accept a minor league assignment from the Mets, but there is the possibility he would go to extended spring training if the team isn’t satisfied his elbow is healthy. Until the recent swelling, Isringhausen appeared in the driver’s seat to secure a bullpen spot.

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D.J. Carrasco, who allowed four runs, three earned, over four innings, is having a sluggish spring, but Collins said he isn’t concerned.

Carrasco figures to have a long relief role with the Mets.

“He’s one of those kind of guys who gets his work in,” Collins said. “We have a very good idea what he brings to the table, and he’s one of those guys who tries to work on stuff, trying to get the ball to sink — different breaking balls and different angles.